Fuel Octane & E10

[Egretboy]

Has anyone seen a difference in performance on the 200 AP running 87 E10 vs say 93 E10 compared to running Rec 90 non ethanol fuel?

[Harper]

I've not run 93 octane E10, but given the choice of the three fuels you've presented, I'd go the non-ethanol every time. I do not like the idea of any ethanol in my boat. As far as octane ratings go, you're wasting money to use any higher octane than what the engine was designed to use. I run 87 octane pure gasoline. Were I forced to use E10, it would be 87 octane, not 93.